For the 2011 Horsepower Challenge, eight of the best pro stock drivers were paired up with eight Horsepower Challenge Sweepstakes contestants. Only one pro stock driver would win the $50,000 purse and only one sweepstakes contestant would walk away with a new 2011 Ford Explorer. Watch the exciting moments as each contestant watches their paired pro stock driver battle it out for the 2011 Horsepower Challenge victory